Focusing adjustment for lamps



y 1931- A. MARTINEK 1,803,433

I FOCUSING ADJUSTMENT FOR LAMPS Filed June 16, 1930 2 Sheets-Sheet 1 INVENTOR BY MW Wwm WW momma May 5, 1931.

A. L. MARTINEK FOCUSING ADJUSTMENT FOR LAMPS 2 Shee tsSheet 2 Filed June 16, 1930 ATTORNEYS I V Patented May 5, 1931 UNITED STATES PATENT 'JOFFICE.

ALOIS L. MARTIN EK, OF DETROIT, IVIICHIGAN, ASSIGNOR TO HALL LAMP COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN rocusme amnsrnnnrroa LAMPS Application filed June 16,

for adjusting the bulb relative to the axis of the reflector so that the light beams may be raised. or lowered with respect to the ground. Another object is to provide a construction 10 in which the bulb retainer and the adjusting 7 means are in substantial alignment at the axis of the lamp and are constructed and arranged in such a way that the desired adjustment may be accomplished easily and quickly by the 15 manipulation of a single operating member.

Another object is to provide a construction that can be manufactured at a comparatively low cost and that can be easily and quickly installed in a lamp. 6

In the accompanying drawings:

Figure 1 is a side elevation of the lamp;

Figure 1A is avertical sectional view.

through a lamp and showing an adjusting mechanism'embodying my invention applied 25 thereto Figure 2 is a detail view of the bulb retainer and yoke;

Figure 3 is an end view of the construction illustrated in Figure 2 Figure 4 is a detail View of the operating member;

Figure 5 is an end view of the construction illustrated in'Figure 4;

Figure 6 is a detail View of the yoke;

Figure 7 is an end view of the construction illustrated in Figure 6;

Figure 8 is another end view of the construction illustrated in Figure 6;

Figure 9 is a top plan view of the construe tion illustrated in Figure 6;

Figure 10 is a sectional view taken on the line 1010 of Figure 1;

Figure 11 is a sectional View taken on the line 11-11 of Figure 1A;

Figure 12 is adetail view of the bushing with a portion of the bulb retainer in place.

Referring now to the drawings, 1 is the lamp casing; 2 is the reflector within the casin 3 is a bushing rigid with the reflector 2 flt t he axis thereof; and 4 is a bulb retainer 1930. Serial No. 461,537.

mounted for tilting movement within the bushing 3 and having bayonet slots 5 therein at diametrically opposite points thereof. Preferably the retainer 4 is also provided at diametrically opposite points with laterally projecting lugs 4 and 4" that engage longitudinally extending slots 8. and 3 respectively in the bushing 8' and prevent rotary move- 'ment of the retainer 4 relative to the bushing.

6 is an electric light bulb having lateral projections 7 and 8 respectively engaging the bayonet slots 5-; and 9 and 10 respectively are any suitable tool such as a screw driver for rotating the same and is provided adjacent its inner end with a notch 20. V The cam 16 is in the form of a disk having a square opening 21 receiving the square portion 17 of the rotating the form of a stamping and is provided at its Opposite ends with a. laterally projecting channel portion 22 and a laterally projecting flat portion 23 respectively. The channel portion 22 receives the cam 16, while the flat portion 23 is received within the inner end of the retainer 4 and is rigidly secured thereto. As shown, the channel portion 22 and cam 16 are held together by means of coil springs 24 and 25 respectively sleeved upon the rotary operating member 14, while the fiat portion 23 has an opening 26 receiving the electrical conductors 9 and 10 and constitutes an abutment for the inner end of the spring 11.

Thus with the construction as described, the bulb 6 may be tilted by merely rotating the rotary operating member 14. This causes the cam 16 to tilt the yoke 18, bulb retainer 4 and bulb 6 as a unit upwardly member and the yoke is in or downwardly relative to the axis of the lamp.

What I claim as my invention is:

1. In a lamp, a lamp casing, a reflector in the casing, a tiltable bulb retainer carried by the reflector, a rotary operating member accessible through the casing at a point in substantial alignment with the retainer, said member having a square portion and a notch, a cam on the square portion, a spring about the member between the casing and cam, a spring about the member between the cam and notch, and a yoke rigid with the retainer, riding the cam, and having a portion between one of the springs aforesaid and said cam.

2. In a lamp, a lamp casing, a reflector in the casing and a tiltable bulb retainer in the reflector, and a coil spring Within the retainer for holding the terminals of electrical conductors in contact with the terminals of a bulb in the retainer, a rotary operating member ournaled in the casing, a cam rigid With the rotary member, and a yoke having a laterally projecting portion secured to the retainer and constituting an abutment for the spring aforesaid and having another laterally projecting portion engaging said cam.

In testimony whereof I afiix my signature.

ALOIS Li MARTINEK. 

